In order to obtain the FAD, the embedding statistics of both the whole clean and distorted test set are generated using a VGGish model [1]}. Then, two multivariate Gaussians are computed from both the test embeddings and the reference embeddings. Finally, the FAD is calculated based on the Fréchet distance between these Gaussians [2]}.
The VGGish model that is employed to obtain the embedding for each sample uses mel spectrograms as its input.
However, the authors verified that the FAD could still be beneficial in recognizing phase distortions.
